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Framework, Bevy is definitely not an engine.

Does it do one thing? It's probably a library.

Is it a collection of libraries that work together focusing on primitives with callbacks? It's probably a framework.

Does it load levels? Have its own schema for an entity? Provide a multiplayer server protocol, and build on primitives? It's probably an engine.

Libraries -> frameworks -> engines -> games.

Bevy is very much an engine. It's an just an engine without an editor.

A really, really well designed engine is just going to be a library of highly modular components with a nice editor or two thrown in.

As the old adage goes "Build libraries not frameworks"

Bevy is definitely an engine. An extremely modular one. I'm currently building a game with it right now and having a blast.